information they let out, don't want it to compromise their investigation or the search but again one u.s. service member dead, a another being held by the taliban according to a government spokesperson in afghanistan. we'll be back with more live news at the top of the hour, we'll have more updates about this breaking situation in afghanistan. >> but first "sanjay gupta m.d." begins now. ♪ ♪ ten, nine, eight, seven, six, five ♪ ♪ you got to go faster >>> good morning, i'm dr. sanjay gupta, welcome to a place where we're going to learn how to live longer and stronger. i'm your doctor and also your coach. we have a special show today, behind me the hudson river, significant because we're going to jump in that river at the beginning of the new york city triathlon, something we've been training for, for some time now. we invited six viewers from around the country to join us, not sure what they were getting themselves into at the beginning. are you ready for this? >> oh, yeah! >> reporter: are you sure? >> it's going to be a little bit of a glimpse on how they got here. 6:41 a.m., su